/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using HTMLParserLucene.Net.Demo.Html.HTMLParser;
using Lucene.Net.Documents;
namespace Lucene.Net.Demo{
/// <summary>A utility for making Lucene Documents for HTML documents. </summary>
public class HTMLDocument
{
internal static char dirSep = System.IO.Path.DirectorySeparatorChar.ToString()[0];
public static System.String Uid(System.IO.FileInfo f)
{
// Append path and date into a string in such a way that lexicographic
// sorting gives the same results as a walk of the file hierarchy. Thus
// null (\u0000) is used both to separate directory components and to
// separate the path from the date.
return f.FullName.Replace(dirSep, '\u0000') + "\u0000" + DateTools.TimeToString(((f.LastWriteTime.Ticks - 621355968000000000) / 10000), DateTools.Resolution.SECOND);
}
public static System.String Uid2url(System.String uid)
{
System.String url = uid.Replace('\u0000', '/'); // replace nulls with slashes
return url.Substring(0, (url.LastIndexOf('/')) - (0)); // remove date from end
}
public static Document Document(System.IO.FileInfo f)
{
// make a new, empty document
Document doc = new Document();
// Add the url as a field named "path". Use a field that is
// indexed (i.e. searchable), but don't tokenize the field into words.
doc.Add(new Field("path", f.FullName.Replace(dirSep, '/'), Field.Store.YES, Field.Index.UN_TOKENIZED));
// Add the last modified date of the file a field named "modified".
// Use a field that is indexed (i.e. searchable), but don't tokenize
// the field into words.
doc.Add(new Field("modified", DateTools.TimeToString(((f.LastWriteTime.Ticks - 621355968000000000) / 10000), DateTools.Resolution.MINUTE), Field.Store.YES, Field.Index.UN_TOKENIZED));
// Add the uid as a field, so that index can be incrementally maintained.
// This field is not stored with document, it is indexed, but it is not
// tokenized prior to indexing.
doc.Add(new Field("uid", Uid(f), Field.Store.NO, Field.Index.UN_TOKENIZED));
System.IO.FileStream fis = new System.IO.FileStream(f.FullName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
HTMLParser parser = new HTMLParser(fis);
// Add the tag-stripped contents as a Reader-valued Text field so it will
// get tokenized and indexed.
doc.Add(new Field("contents", parser.GetReader()));
// Add the summary as a field that is stored and returned with
// hit documents for display.
doc.Add(new Field("summary", parser.GetSummary(), Field.Store.YES, Field.Index.NO));
// Add the title as a field that it can be searched and that is stored.
doc.Add(new Field("title", parser.GetTitle(), Field.Store.YES, Field.Index.TOKENIZED));
// return the document
return doc;
}
private HTMLDocument()
{
}
}
}
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